package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Slf4j
//@WebFilter("/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public static  final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;
        String requestURI = request.getRequestURI();
        log.info("拦截请求为 {}",requestURI);
        //定义不需要处理的请求路径
        String [] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**"
        };
        // 调用 check方法  判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //判断是否登录过
        if(request.getSession().getAttribute("employee")!=null){
            log.info("已登录,用户id为{}",request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;



    }
        //检查是否需要放行
    public boolean check(String[]urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
